#!/usr/bin/python3
# -*- coding: utf-8 -*-

from multiprocessing import Process, Queue  
import os, time, random  
  
# 写数据进程执行的代码:  
def write(q):  
    print('Process to write: %s' % os.getpid())  
    for value in ['A', 'B', 'C']:  
        print('Put %s to queue...' % value)  
        q.put(value)  
        time.sleep(random.random())  
  
# 读数据进程执行的代码:  
def read(q):  
    print('Process to read: %s' % os.getpid())  
    while True:  
        value = q.get(True)  
        print('Get %s from queue.' % value)  
  
if __name__=='__main__':  
    # 父进程创建Queue，并传给各个子进程：  
    q = Queue()  
    pw = Process(target = write, args = (q,))  
    pr = Process(target = read, args = (q,))  
    # 启动子进程pw，写入:  
    pw.start()  
    # 启动子进程pr，读取:  
    pr.start()  
    # 等待pw结束:  
    pw.join()  
    # pr进程里是死循环，无法等待其结束，只能强行终止:  
    pr.terminate() 
